Electric-arc lamp.



No. 643,834. Patanted Feb. 20, I900.

' C. J; TUEBRING.

ELECTRIC ABC LAMP.

(Application filed July 18, 1899.)

(No Model.) -3 Shuts-Sheet .l,

German c i/rer IY/rc'.

Force/8177.

Ina 4971i??? m: norms PEYzRs co, Pno'roumn, wASmuumN. n, c.

No. 643,834. Patented Feb. 20, won 0. J. TDERRING.

ELECTRIC ARC LAMP.

(Application filed Ju1y 18, 1899.)

3 Sheets-Shut 2-.

'lhveizZ or I 77WY ZarIfi 7 (No Model.)

ms Noaaes PETERS co, PHoTuun-la, WASHINGTON, D c.

No. 543,834. 7 Pa tented Feb; 20, I900.

c. J. mznnma. ELEGTRICARC LAMP.

(Application filed July 18, 1899.)

3 $heets-Sheet' 3.

(No Model.)

err/21 m: uonms PETERS 00., PHOTO-LITHO.. WASHINGTON. u. c.

NITED STATES PATENT CHRISTIAN J. TOERRING, or PHILADELPHIA, PENNSYLVANIA;

ELECTRIC-ARC LAMP;

SPECIFICATION forming part of Letters Patent Nb. 643,834, dated February 20, 1900. Application filed July 18,1899. Serial No. 72 1.260. (N0 model.)

To whom it may concern:

Be it known that I, CHRISTIAN J. TOERRING, a citizen of the United States, and a resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Arc-Lamps, of which the following is a specification.

The object of my invention is to construct an arc-lamp of the type in which the arc is formed within a small and substantially airtight globe for the purpose of increasing the life of the carbons; and my invention ,consists in the construction and arrangement of parts, which will be hereinafter described and claimed.

In the drawings, Figure 1 is in part a 1011- gitudinal section and in part aside elevation of my improved lamp. Fig. 2 is a side elevation of the lamp. Fig. 3 is a detail showing the arrangement of the upper-carbon-carrying device, and Fig. 4 is a cross-sectional plan taken on the line 4 4 of Fig. 1.

The top plate 19 has attached thereto a porcelain insulator 191, from which the lamp is supported. Integral with or attached to the top plate 19 is an annular casting 192. A casting 6, which is shown as having three legs, is secured to the annulus 192 by means of screws, as seen in Fig. 2. There is, however, a layer of insulating material placed between the contacting surfaces of the cast-ing 6 and the annulus 192. To the legs of the casting 6 there is secured a solenoid-supporting plate 7. The plate 7 is, however, insulated from the casting 6, as indicated in Fig. 1. To the plate 7 a heat shield 13 is in turn secured by means of screws 131.

Rigidly secured to the inside surface of the casting 6 at the top is a supporting-tube 8, which extends from the casting 6 downwardly through an aperture in the plate 7, the construction being such that there is no contact at any time between the tube and plate. To

the lower end of the tube 8 I firmly secure a cap-plate 14. This cap-plate 14 has an inwardly-projecting flange a, and has, furthermore, a thread 141 east or formed on its exterior surface.

On the top of the cap-plate 14 rests a cylinder of porcelain or other insulating material, having grooves in its exterior surface, in which grooves a naked helix of resistancewire is wound. It will be readily understood that the ridges between the grooves of the porcelain insulate the several turns of the resistance-Wire from each other. There is a con ducting-band 100, which slides up and down upon the resistance-wire and serves to make contact with any given turn thereof, so as to out into or out of the circuit as many turns as may be desired.

Against the bottom surface of the cap-plate 14 the inside globe 17 of the lamp is pressed and is there held by a screw-cap 18, which threads upon the screw-thread on the plate 14. The lower edge of the screw-cap presses against a bead 22 on the globe 17. I thereby secure a double sealing of the inside globe 17 both at the contacting surface of the globe with the cap-plate and at the contacting surface of the screw-cap with the globe and cap-v plate.

The inside globe 17 is of a type which is well understood in the art and which is clearly differentiated from the types of globes which are merely protecting-globes-such, for in stance, as the outside globe indicated by dotted lines in Fig. 2. The globe 17, in fact, is not only made air-tight, but is also made so small that the gases in it can become highly heated. This has as a result that the life of the carbon is much prolonged, it being not uncommon for carbons in lamps of this character to burn one hundred hours as against five or six hours when the large globes are used, which are mere protecting-globes and have no electrical function, even though they be made air-tight. The gases inside of such small air-tight globes 17 also become semiluminous when the lamp is in operation. I repeat, then, that the globe 17 is in these respects sharply differentiated from mere protecting-globes, the two classes of globes belonging to diiferent types.

The carbon-carrying tube 9 slides within the tube 8. It is guided at the top by a ring or projection B, secured thereto and fitting substantially air-tight in tube 8. At the bottom it is guided by passingin a substantially air-tight fashion through the orifice in the flange a in the cap-plate 14. Secured to the the top plate 19.

bottom of tube 9 is a standard 10, on which is pivoted a ring-clutch 11 of common form. The base against which this ring-clutch rests is formed by a plate 15, secured on the one side to the negative frame 16 of the lamp and secured on the other side to the arm 151, which projects downwardly from the cap-plate.

To the upper end of the tube 9 is secured the plunger 26 by means of the connectingpiece 2'7. The plunger 26 moves up and down within a dash-pot 21, the casing of which is secured to the inside of the casting 6. The casing 21 is not in electrical connection with the casting 192.

A chain 5 is secured at one end to the upper end of the tube 9 and 'passing over a pulley 1 is secured at the other end to the standard t, which is in turn connected with the armatures or cores 3 of the regulating solenoids or magnets 2. These solenoids 2 instead of being wound with copper wire are wound with resistance-wire, preferably of German silver, and form part of the necessary deadresistance of the lamp when it is used on a constant-potential circuit. The resistancewire may be insulated by embedding it in porcelain, by winding it in grooves on a porcelain cylinder, or in any other convenient manner.

The outer casing of the lamp may now be described. The nppersection, as shown, consists of four sections 241, 242, 243, and 244, which are secured to each other by screws or in any other convenient fashion. The upper section 2 11, as shown, is secured by screws to The lower sections 2&3 244 are secured to the plate 7 by screws. The section of the globe-casing 245 is secured to the plate 13 at its upper end. This casing is provided with air-vents, as shown. Formed in the bottom of this. casing there are bayonet-jointed slots for the purpose of securing the globe-holder 246, as will be readily understood. The globe-holder 2&6 carries screws 247 for the purpose of securing the outer globe of the lamp.

The current passes from the binding-post 28, which is secured to and insulated from the top plate 19, down to the solenoids 2 and through to the frame 6. From this frame 6 the current passes to the tube 9 and through the carbonholder 91 within that tube to the upper carbon. Thence the current passes to the negative carbon, to the negative frame 16, to the lower terminal 100 of the resistance 12, and through this resistance to the bindingpost 20.

The operation of the lamp will now be obvious. The magnets or solenoids 2 when the current is passed through the lamp act to strike the are in a manner that is Well understood and to keep the are at proper length at all times. The are being formed in a substantially air-tight structure, there will be little consumption of the carbons, and their life will be long. If the arc is to be used on a constant-potential circuit, the rheostat 12 is useful to adjust for the differences between the normal volt-age of the lamp and the voltage of the circuit from which it is fed. By making the feeding or regulating solenoids 2,which are in series, of resistance-wire the amount of wire which is necessary for the rheostat 12 is considerably reduced. By insulating the casting 6 from the plates '7 and 19 it will be seen that I may fasten the outer casing of my lamp to these two plates 7 and 19 without putting the outer casing in the circuit. The same remark applies to the lower section of the easing 245, which, being secured to the plate 13, is also out of circuit. The manner of supporting the rheostat 12 is especially convenient, and the plate 13 acts as a shield to prevent the heat which is given off from the rheostat and from the lower globe from heating the upper part of the lamp. The plate acts to divert the heated air through the air-vents in the casing 245.

It will be noticed that while the cylinder is attached with a double sealing this also applies to the opening in the cap-plate, the bushing here being supplemented by the flange extension at the upper end of the carbon-carrying tube.

The lamp may also be adapted for other than constant-potential circuits, in which case the supporting-magnets would be wound with copper, other suitable changes in the regulating mechanism also being made without disturbing the features of the lamp as herein described.

It is often necessary to insert the upper carbon into the upper-carbon-earrying tube 9 when the lamp is very hot. In such case it is impossible for the operator to grasp the carbon-carrying tube with his fingers. If he attempts to insert the upper carbon from below and to push it into the tube, this tube will slip upwardly within the outer tube 8. In order to prevent this upward movement of the carbon-carrying tube 9 when the carbon is being inserted therein, I employ an aperture 97 at the lower end of the carbon-carrying tube. hen now a wire or small rod is inserted through this aperture and the carbon is pushed from below into the carbon-carrying tube 9, the wire will abut against the lower surface of the cap-plate and prevent further upward movement of the carbon carrying tube 9 within the outer tube 8, so as to enable the carbon to be inserted within the carbonholder.

What I claim is- 1. An arc-lamp comprising the combination of a cap-plate, an arc-inclosing globe supported by and secured substantially airtight thereto, an outer tube secured thereto, a carbon inclosing and holding tube sliding at its lower end substantially air-tight within, and

guided by, an aperture in the cap-plate, a flange for guiding the upper end of the carbon-holding tube within the outer tube, a

pulley, a chain and an electromagnet for 0peratingthe carbon-holdingtube,substantially as described.

2. The combination of a cap-plate having ascrew-thread on its outer surface, a globe pressed substantially air-tight against the under surface, and having a bead removed from the edge of the globe, and a screw-cap for connecting the parts and effecting a double seal, substantially as described.

3. The combination of a top plate, a casting secured thereto at its top but insulated therefrom, a solenoidsupporting plate secured to but insulated from the bottom of the casting and a globe-casing secured to the respective plates, substantially as described.

4. The combination of a top plate, a tube suspended therefrom, a cap-plate secured to the tube and a solenoid-supporting plate secured to and insulated from the top plate and tube, substantially as described.

5. A top plate, a legged casting and a magnet-supporting plate secured to but insulated from each other, a supporting-tube secured, at its top, to the casting and supporting, at its bottom, the cap-plate for the globe, a carbon-carrying tube sliding within the supporting-tube and an electromagnet mounted on the supporting-plate for actuating the carboncarrying tube, substantially as described.

6. A top plate, alegged casting and an electromagnet-supporting plate secured to butinsulated from each other, a supporting-tube connected at its top with the casting and supporting the cap-plate for the globe, and a rheostat surroundingthesupportingtube between the cap-plate and the electromagnet-supporting plate, substantially as described.

7. The combination with the top plate, the clectromagnet-supporting plate and an intervening casting connected thereto but insulated therefrom, a supporting-tube connected at the top to the casting and supporting at the bottom a cap-plate for the globe, a rheostat between the cap-plate and the solenoid-supporting plate and a heat-shield above the rheo-. stat, substantially as described.

S. The combination of the top plate, a solenoid-supporting plate and an intervening casting connected to but insulated from the plates, the solenoidsupporting plate carrying a heatshield and an outer globe-casing having its sections secured to the top plate, the solenoidsupporting plate and the heat-shield respectively, substantially as described.

9. The combination of a top plate, a solenoid-supporting plate and an intervening castting connected thereto but insulated therefrom, the solenoid-supporting plate carrying a heat-shield, a lamp-casing secured to the plates and to the heat-shield respectively and a globe-holder secured to the lamp-casing,substantially as described.

10. The combination of the cap-plate having a globe secured directly to its under surface and a hollow rheostat supported on its upper surface, a carbon holding and containing tube holder moving within the rheostat and an aperture in the cap-plate and an electromagnet, pulley and chain supported above the rheostat for actuating the carbon-holder, substantially as described.

11. The combination of the top plate, an electromagnet-supporting plate and a casting connected to but insulated from these plates, a tube suspended from the casting but passing freely through an aperture in the solenoid-su pportin g plate and carrying a cap-plate at its lower end, a carbon-carrying tube moving within the first-mentioned tube and electromagnetic means for operating the carboncarrying tube, substantially as described.

12. A constant-potential arc-lamp having its regulating-coil in series and wound with resistance-wire constituting a portion of the resistance of the lamp and a supplementary resistance to adjust for the voltage of the circuit substantially as described.

13. The combination of a cap-plate carrying a guiding-tube, a carbon-carrying tube, suspended from its top and carrying a clutch at its lower end, moving substantially airtight in the guiding-tube, substantially as described.

let. The combination of a cap-plate carrying a guiding-tube, a carbon-carrying tube, suspended from its top and carrying a clutch at its lower end, moving substantially airtight through a bushing near its lower end and having a flange at its top fitting the guiding-tube in a substantially air-tight manner, substantially as described.

15. The combination of a cap-plate, a carbon-carrying tube moving therewithin and' having a'locking-aperture in its side, substantially as described.

16. An arc-lamp comprising a top plate, a supporting-tube secured thereto, a cap-plate secured to the lower end of the supportingtube, a small globe supported by and secured to the cap-plate in an air-tight fashion a carbon inclosirrg and carrying tube passing substantially air-tight through an aperture in the cap-plate and a clutch carried thereby, substantially as described.

17. An arc-lamp comprising a top plate, a supporting-tube, a cap-plate secured to the tube, a small globe supported by and secured to the cap-plate in an air-tight fashion and a carbon holding and inclosing tube passing substantially air-tight through an aperture in the cap-plate, having a guiding-flange within the supporting-tube at the upper end and carrying a clutch at its lower end.

18. An arc-lamp comprising a top plate, a

supporting-tube, a cap-plate secured to its lower end, a hollow rheostat supported on its upper surface and surrounding the tube and a small globe secured air-tight to its lower surface, substantially as described.

19. An arc-lamp comprising a top plate, a supportingtube, a cap-plate secured to its lower end, a globe secured air-tight to the} In testimony whereof I have signed my .P

under face of the cap-plate, a hollow rheostat name to this specification in the presence 01. surrounding the tube and supported on the two subscribing witnesses.

7 upper face of the cap-plate, and eiectromag- CHRISTIAN J. TOERRING.

netic operating devices for the carbon within Witnesses:

the tube supported above the rheostat, sub- I. ROTH,

stantially as described. J. WV. SYLVESTER. 

